where \(\mathcal {M}\)  is a subset of entanglement witnesses. The specific choice of this subset results in measures with different interpretations. To give concrete examples, if \(\mathcal {W}\)  is the set of all entanglement witnesses, choosing \(\mathcal {M}_{\text{BSA}}=\lbrace W\in \mathcal {W} | \mathbb {1}+W \ge 0 \rbrace \)  yields the BSA \(\mathcal {E}_M(\rho )=\mathcal {E}_{\text{BSA}}(\rho )\) , while
choosing \(\mathcal {M}_{\text{GR}}=\lbrace W\in \mathcal {W} | \mathbb {1}-W \ge 0 \rbrace \)  results in the generalized robustness of entanglement \(\mathcal {E}_M(\rho )=\mathcal {E}_{\text{GR}}(\rho )\)  [1]}.
